Beraht tasks the Dwarf Commoner and Leske with dealing with a smuggler that is holding out on him as part of the quest Beraht's Favor. Oskias can be found in Tapster's Tavern seated at a table. When he is confronted, he attempts to bribe his way out with a nugget of lyrium, the Dwarf Commoner can:

Kill Oskias, which will yield some extra XP, two Lyrium nuggets and minor loot

Spare Oskias without any reward

Accept a bribe of one nugget from Oskias

Accept a bribe of two nuggets from Oskias (with intimidation)

If Oskias is allowed to live, Beraht learns about that from a patron who was at Tapster's at that moment, however it may be possible to be persuaded that Oskias was eventually killed, but in a less populous place.